Add rock wall to the habitats list (for rock worms), and move monster

classes' associated habitats into the monsterentry struct.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3182 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on January 3, 2008
CG4TL4AKSN4J7CMATZFJ5N7PSDCQXLS3QYX7PZ3K67KMMBT675OQC
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